5 features of True Sleeper Premium 3.5 Features: 1. Ultra Visco Elastic memory foam. The ultra-visco elastic was developed with a hint of memory foam that NASA has developed for astronauts. Excellent elasticity and resilience due to body temperature and body pressure, the rebound force and shape will change, so it fits your body like a custom made product. Made with 100% memory foam for a good nights sleep. 2. Distributes body pressure on your lower back and shoulders: Regular mattresses concentrate body pressure on the lower back and shoulders, so the blood vessels in the area are compressed and poor blood circulation causing stiffness and pain. True Sleeper Premium 3.5 disperses body pressure and gently hugs the entire body. 3. Straighten your lower back and keep you in an effortless sleep posture. If your spine is distorted, it can strain your neck and waist. True Sleeper Premium 3.5 is made of memory foam so you can keep your posture in no time. 4. Only 1.4 inches (3.5 cm) thick, so it is lightweight and easy to handle. It is only 1.4 inches (3.5 cm) thick. This thickness ensures a snug, snuggly sleep on your True Sleeper memory foam mattress. Lightweight and easy to handle, so it is easy to carry. 5. Place it on your existing comforter or bed without any special bed You can use your current comforter or bed as is. Economical because you dont need to replace your new bedding. Simply lay the True Sleeper Premium 3.5 and youll have a comfortable nights sleep.